Valve-operating mechanism



Patented Qct. 20, 1925.

UNITED STATES DORSEYF. ASBRY, OF WASHINGTON, DISTRICT OF COLUMBIA.

- vALVEoPERATING MncHANIsi/r.

Application led April 19, 1920. Serial No. 374,996.I

To @Zlio/710m# may con-ocra.'

Be it known that I, Doasnr F. Assurer, a citizen of the United States,residing at 'Vashington, in the District of Columbia, have inventedcertain new and useful Improvements in Valve-Operating Mechanism, ofwhich the following is a specification.

My invention rela-tes to improvements over the construction of rocker]arms for valve operating mechanisms as described and claimed in mycopending` application, filed F eb. 21, 1920, serially numbered 860,487,whereby friction and consequently wear and the necessity for lubricationof the points of contact between a rocker arm and the parts of themechanism `with which it is operatively associated is eliminated.

The accompanying drawings are illustrative of the preferred embodimentof my improved rocker arm construction.

In the drawings- Fig. 1 is a. vertical section through a por-- tion ofan internal combustion engine showing the application of my inventionthereto; and

Fig. 2, is a Sectio-n on the line 2-2 of Fig. 1.

Referring to the drawings in det-ail, A designates, generally, a portionof an internal combustion engine including a cylinder 10 and cylinderhead 11. Seating on the head 11 is a puppet valve 12, the stem 13 ofwhich extends through and above the head 11 and has associated therewitha spring 111 normally holding the valve to its seat. Disposed inoperative relation to the valve is a tappet rod 15, and bridging theupper ends vof said valve stem and said tappet rod is a rocker arm 16,fulcrumed intermediately whereby desired operation of the valve isaccomplished upon actuation of the tappet rod, the latter being operatedin any well known or preferred manner as by cam means not shown.

My invention consists in the provision of improved means whereby ananti-frictionyal fulcrum. is provided fon said rocker arm and ananti-frictional Contact is provided between the rocker arm and the valvestem and tappet rod respectively, whereby noise, wear and the necessityfor lubricating these relatively contacting parts is eliminated. Thepreferred arrangement for accomplishin'g these purposes is illustratedin the accompanying drawings and consists in prowith respect to one faceofthe rocker arm in order that the valve stem and tappetrod may projectinto/them a sutlicient distance to enable the walls surrounding them toprevent excessive lateral displacement of `the valve stem and tappet rodwith respect to the rockerl arm. Smaller openings 19 and 20 respectivelyare provided in lthe rocker arm at right'a-ngles to the first mentionedopen-' ings, and said latter openings respectively intersect the firstmentioned openings at points somewhat remote fromv theI face of therocker arm through whichthe valve stem and tappet rod project. "Hardenedvpins v21 ably as illustrated by spinning the relatively soft metal ofthe rocker arm around the ends of the pins. By this arrangement theportion of the pins extending transversely across the openings 17 and 18provides a hardened curved surface for contact with the upper flat endsof the valve stem and tappet rod. If desired, members 23 and 24: havinghardened fiat surfaces for contact with saidpins may be provided o-n theupper ends of the tappet rod and valve stem respectively, although suchmembers are not essential to an efficient operation of the rocker arm.

At an intermediate point in the face of the rocker arm opposite to theface first referred to, that is, the upper face in the presentdisclosure, I provide an opening 25 similar to either of the openings 17or 18 and associate therewith a pin 26 in a manner similar to theassociation of the pins aforementioned with the first openings.Likewise, in a bracket 27 secured to the cylinder head I provide anopening 28 and an intersecting pin 29, and between the pins 26 and 29with its flat ends in contact with said pins and portions of its bodyprojecting into the openings 25 and 28 I interpose a member 30 providinga iiexible fulcrum for the rocker arm.

From the foregoing it is believed that the operation and advantages ofmy invention will be clearly understood, it being apparent that uponactuation of the tappet rod ka rolling action will occur between the vand22 are fixed 1in thefopenings19 `and 20 "respectively in any desiredmanner," preferdrical pin fitted within one of said openings Vwhereby aside portion thereof provides within the other opening a convex bearingsurface having parallel elements.

2. In a valve 'mechanism, a rocier arm provided with a pair of openingsintersecting one another at right angles, and a cylindrical pin fittedwithin one of said openings whereby a side portion thereof provideswithin the other opening a convex bearing surface having parallelelements, the azie of said Vopenings and pin being at right angles tothe longitudinal anis of the rocher arm. f

3. In a valve mechanism, a rocker arm provided with a pair of openingslocated adjacent to its ends, respectively, and forming guides for theends of a valve stem and push rod, respectively, said rocker arm furtherbeing provided With a'third openingl located intermediately thereof andforming a guide for a fulcrum member, said rocker arm further havingother openings interseating said first mentioned openings at rightangles, respectively, and a hardened cylindrical pin fitted in each ofsaid last mentioned openings and forming within veach of the firstmentioned openings a conveX bearing surface having parallel elementswith which said valve stem, push rod and fulcrum member, respectively,are adapted to have rolling contact.

Ll. In a valve mechanism, a member provided with a pair of openingsintersecting one another at right angles, and a cylindrical pin fittedwithin one of said openings whereby a side portion thereof provideswithin the other' opening a convex bearing surface having parallelelements, said second mentioned opening being of limited depth andterminating substantially where it intersects the pin receiving openingwhereby the pin is supported throughout'its length vat the side thereofopposite lsaid first mentioned opening by the material of the member.

In testimony whereof I hereunto' affix my signature.

DORSEY F. AsBUnY.

